Radiotron
真空管, 三极电子管
🗣️ 情景例句
How about a cup of coffee, Son?
来杯咖啡怎么样， 孩子？
He is good at reading and writing, but he wishes he knew how to understand and speak better.
他的阅读和写作是强项，但他希望知道怎样去理解和说得更好。
It's a fine day。
今天是个好天。